Back to EveryPatent.com
United States Patent | 5,623,323 |
Johnson ,   et al. | April 22, 1997 |
A contact-type ophthalmic lens for use in diagnosis and laser surgery has a contact lens (14), an entry lens (16), and an intermediate lens (18). The lenses are aligned along their optical axes. The anterior surface of the contact lens has an aspheric surface with a high power. The intermediate lens is a meniscus lens with a concave posterior surface and a convex anterior surface. Both surfaces of the entry lens are convex and aspheric. This combination of lenses provides a very wide field of view, allowing regions of the eye anterior to the equator to be readily viewed in an aerial image focused in a plane (50) anterior to the lens system.
Inventors: | Johnson; Robert D. (Bellevue, WA); Crossman; Janet L. (Bellevue, WA); Mainster; Martin A. (Leawood, KS) |
Assignee: | Ocular Instruments, Inc. (Bellevue, WA) |
Appl. No.: | 329712 |
Filed: | October 26, 1994 |
Current U.S. Class: | 351/219; 351/160R |
Intern'l Class: | A61B 003/00; G02C 007/04 |
Field of Search: | 351/219,247,160 R |
3770342 | Nov., 1973 | Dudragne | 351/7. |
3820879 | Jun., 1974 | Frisen | 351/1. |
3954329 | May., 1976 | Pomerantzeff | 351/16. |
4023189 | May., 1977 | Govignon | 354/62. |
4027952 | Jun., 1977 | Hugues | 350/189. |
4134647 | Jan., 1979 | Ramos-Caldera | 351/6. |
4222634 | Sep., 1980 | Muchel | 350/189. |
4265519 | May., 1981 | Pomerantzeff | 351/16. |
4357088 | Nov., 1982 | Pomerantzeff | 354/62. |
4410245 | Oct., 1983 | Koester | 351/219. |
4452514 | Jun., 1984 | Spitznas | 351/206. |
4469413 | Sep., 1984 | Shirayanagi | 350/432. |
4502764 | Mar., 1985 | Riquin | 351/160. |
4627694 | Dec., 1986 | Volk | 351/214. |
4637699 | Jan., 1987 | Sigelman | 351/205. |
4669839 | Jun., 1987 | Muchel | 351/221. |
4671631 | Jun., 1987 | Sigelman | 351/205. |
4682866 | Jul., 1987 | Volk | 351/205. |
4704018 | Nov., 1987 | Takahashi | 351/206. |
4721378 | Jan., 1988 | Volk | 351/205. |
4728183 | Mar., 1988 | Heacock et al. | 351/219. |
4738521 | Apr., 1988 | Volk | 351/205. |
4801198 | Jan., 1989 | Heacock | 351/214. |
5007729 | Apr., 1991 | Erickson et al. | 351/219. |
5189450 | Feb., 1993 | Crossman et al. | 351/219. |
5200773 | Apr., 1993 | Volk | 351/219. |
5309187 | May., 1994 | Crossman et al. | 351/219. |
Foreign Patent Documents | |||
124502 | May., 1984 | EP | 351/219. |
2136927 | Dec., 1972 | FR. | |
2248814 | May., 1975 | FR | 351/219. |
1188326 | Mar., 1965 | DE | 42/32. |
2246182 | Mar., 1974 | DE | 351/219. |
2660505C2 | Sep., 1977 | DE | 351/219. |
2610821 | Dec., 1977 | DE. | |
2559668 | May., 1979 | DE. | |
2203260 | Oct., 1988 | GB. |
Sudarsky, R.D., Volk, D., "Aspherical Objective Lenses as an Aid in Indirect Ophthalmoscopy, A Preliminary Report," Reprinted from American Journal of Ophthalmology 47:572-575 (Apr. 1959). James H. Allen, M.D., May's Manual of the Diseases of the Eye for Students and General Practitioners, 24th ed., The Williams & Wilkins Company, Baltimore, 1968, p. 280. Schlegal, H.J., "Simple Wide-Angle Optics for Split Lamp Microscopy Examinations of the Fundus of the Eye (Panfundoscopy)," Documenta Ophthalmologica 26:300-308 (1969). Sir Stewart Duke-Elder and David Abrams, System of Ophthalmology, vol. 5, Ophthalmic Optics and Refraction, The C.V. Mosby Company, St. Louis, 1970, p. 423. Pomerantzeff, O., Govignon, J., "Design of a Wide-Angle Ophthalmoscope," Arch. Opthal. 86:420-424 (Oct. 1971). Pomerantzeff, O., "A Lens System for Wide-Angle Fundus Photography," Ophthalmic Photography 16:101-108 (Summer 1976). Pomerantzeff, O., "Theory and Practice of the Equator Plus Camera (EPC)", Conf. Proceedings of International Symposium on Ophthalmological Optics (May 7-9, 1978) 117-118. Pomerantzeff, O., Webb, R.H., Delori, F.C., "Image Formation in Fundus Cameras," Invest. Ophthalmol. Visual Sci. 18:630-637 (Jun. 1979). Pomerantzeff, O., "Wide-Angle Noncontact and Small-Angle Contact Cameras," Invest. Ophthalmol. Visual Sci. 19:973-979 (Aug. 1980). Charles, L. Schepens, M.D., Retinal Detachment and Allied Diseases, W.B. Saunders Company, Philadelphia, 1983, Ch. 43, "New and Improved Diagnostic and Surgical Procedures," pp. 1107-1155. P. Roussel et al., "Contact Glass for Use . . . Optical Aspects," International Ophthalmology 6:183-190 (1983). Dieckert, J.P. et al., "Contact Lenses for Laser Applications," Ophthalmology: Instrument and Book Supplement 79-87 (1984). Arnold Sorsby, Ch. 34, "Biology of the Eye as an Optical System," pp. 1-17. |
______________________________________ Contact Preferred Most Preferred ______________________________________ R.sub.1 4.27 to 7.93 mm 6.10 .+-. 0.31 mm b.sub.1 -5 to 0 -1.244 .+-. 0.062 R.sub.2 -9.0 to -6.0 mm -7.45 .+-. 0.37 mm t .75 to 4.53 mm 2.74 .+-. 0.15 mm n 1.44 to 1.97 1.49 .+-. 0.01 d 13.0 to 21.0 mm 17.1 .+-. 0.2 mm ______________________________________ Intermediate Preferred Most Preferred ______________________________________ R.sub.1 8.75 to 16.25 mm 12.50 .+-. 0.63 mm R.sub.2 -39.00 to -21.00 mm -30.00 .+-. 1.50 mm t 3.32 to 6.68 mm 5.0 .+-. 0.2 mm n 1.44 to 1.97 1.71 .+-. 0.01 d 17.0 to 25.0 mm 21.0 .+-. 0.2 mm ______________________________________ Entry Preferred Most Preferred ______________________________________ R.sub.1 10.47 to 19.44 mm 14.95 .+-. 0.75 mm b.sub.1 -10 to 0 -1.929 .+-. 0.096 R.sub.2 49.16 to 91.29 mm 70.23 .+-. 3.51 mm b.sub.2 -16 to 0 -8.782 .+-. 0.439 t 6.5 to 14.5 mm 10.0 .+-. 0.2 mm n 1.44 to 1.97 1.81 .+-. 0.01 d 27.0 to 35.0 mm 31.0 .+-. 0.2 mm ______________________________________